Effect of liquid properties on the performance of bubble column reactors with fine pore spargers

Mouza, A.A.; Dalakoglou, GK; Paras, S.V.

doi:10.1016/j.ces.2004.10.013

Cited by 169 publications

(129 citation statements)

References 17 publications

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“…Finally, at the heterogeneous regime the gas holdup continues to increase, but with a lower slope than the homogeneous regime [6]. Figure 6 shows the dependence of gas holdup on corresponding gas superficial velocity for the two bubble columns used.…”

Section: Gas Holdupmentioning

confidence: 96%

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On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Ag¹,

Ti²,

Ap³

et al. 2018

Preprint

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Abstract:In our previous works we have proposed design equations that can predict with reasonable accuracy the transition point from homogeneous to heterogeneous regime as well as the gas holdup and the mean Sauter diameter at the homogeneous regime. The validity of the proposed correlations was checked with data obtained using different geometrical configurations and several Newtonian and non-Newtonian liquids as well as the addition of surfactants. However, in all the experiments the gas phase was atmospheric air. This work investigates the effect of gas phase properties by conducting experiments employing various gases (i.e., air, CO 2 , He) that cover a wide range of physical property values. Experiments revealed that only the use of low-density gas (He) has a measurable effect on bubble column performance. More precisely, when the low-density gas (He) is employed, the transition point shifts to higher gas flow rates and the gas holdup decreases, a fact attributed to the lower momentum force exerted by the gas. In view of the new data, the proposed correlations have been slightly modified to include the effect of gas phase properties and it is found that they can predict the aforementioned quantities with an accuracy of ±15%. It has been also proved that CFD simulations are an accurate means for assessing the flow characteristics inside a bubble column.

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Section: Gas Holdupmentioning

confidence: 96%

“…In previous works conducted in this laboratory [2,[6][7][8] we have experimentally studied the effect of the sparger characteristics (i.e. diameter, pore size), the liquid physical properties and the gas flow rate on the performance of a bubble column equipped with a fine pore sparger.…”

Section: Introductionmentioning

confidence: 99%

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Ag¹,

Ti²,

Ap³

et al. 2018

Preprint

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“…Also, the presence of ethanol in the liquid mixture reduced the surface tension of the liquid which enhanced the reduction of bubble size formed [19,20].…”

Section: Bubble Size Analysismentioning

confidence: 99%

Microbubble Distillation for Ethanol-Water Separation

Al-Yaqoobi

Hogg²,

Zimmerman

2016

International Journal of Chemical Engineering

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In the current study, a novel approach for separating ethanol-water mixture by microbubble distillation technology was investigated. Traditional distillation processes require large amounts of energy to raise the liquid to its boiling point to effect removal of volatile components. The concept of microbubble distillation by comparison is to heat the gas phase rather than the liquid phase to achieve separation. The removal of ethanol from the thermally sensitive fermentation broths was taken as a case of study. Consequently the results were then compared with those which could be obtained under equilibrium conditions expected in an "ideal" distillation unit. Microbubble distillation has achieved vapour compositions higher than that which could be obtained under traditional equilibrium conditions. The separation was achieved at liquid temperature significantly less than the boiling point of the mixture. In addition, it was observed that the separation efficiency of the microbubble distillation could be increased by raising the injected air temperature, while the temperature of the liquid mixture increased only moderately. The separation efficiency of microbubble distillation was compared with that of pervaporation for the recovery of bioethanol from the thermally sensitive fermentation broths. The technology could be controlled to give high separation and energy efficiency. This could contribute to improving commercial viability of biofuel production and other coproducts of biorefinery processing.

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“…More recent work has used photography [23]- [25][44]- [47], nonisokinetic withdrawal in conjunction with electro-optic detection [48], two needle local probes [49], four fibre optic probes [50] and a Wire Mesh Sensor [21]. The liquids used were almost exclusively water with different chemical dissolved in them, e.g., Na2CO3, NaHCO3, NaOH [43], DEA [44], TEA [45], polymer plus surfactant [46] and surfactant [47].…”

Section: Figmentioning

confidence: 99%

“…However, the data on the effect of liquid viscosity are limited. The liquid viscosity investigated in [23] is up to 0.02 Pa s. The Wire Mesh Sensor was also employed to study the bubble behaviour of silicone oil (properties given in Table 1) [51] The objective of this study is to show that a liquid, an aqueous solution of glycerol/potassium chloride whose physical properties are similar to the ionic liquid, e.g.,…”

Section: Figmentioning

confidence: 99%

Characterisation of an analogue liquid for hydrodynamic studies of gas-ionic liquid flows

Azzopardi

Agunlejika

Zhao

et al. 2017

Chemical Engineering Journal

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Ionic liquids are liquid salts at low temperatures (normally less than 100°C). They are powerful solvents with very low vapour pressure. They have great potentials in many applications such as gas absorption and chemical synthesis. However, they are expensive. This limits extensive studies towards establishing phenomenological models. To address this limitation, an analogue liquid, with properties similar to an ionic liquid, has been identified which on the grounds of cost and safety appears to be suitable.In this paper, the hydrodynamic behaviour of an ionic liquid in a bubble column is compared with those of water and other liquids with similar physical properties. Average gas holdup, bubble coalescence, bubble size and specific interfacial area with different liquids are examined. Gas hold-up was determined by monitoring the change of conductivity between two flush mounted rings. The differences in bubble size and coalescence are revealed by analysing the stills taken from a high speed video camera. The dominant flow pattern in a small diameter column with ionic liquids or other fluids having similar viscosity is slug flow. The small bubbles in the liquid slugs make a smaller contribution to the specific interfacial area than Taylor bubbles. It is observed that Taylor bubbles can coalesce. The hydrodynamics of an ionic liquid in a bubble column can be estimated from that of a fluid with similar physical properties.

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Effect of liquid properties on the performance of bubble column reactors with fine pore spargers

Cited by 169 publications

References 17 publications

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Microbubble Distillation for Ethanol-Water Separation

Characterisation of an analogue liquid for hydrodynamic studies of gas-ionic liquid flows

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